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Breadfan

14 Posts
Posted - 07/11/2018 :  12:56:09 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8.5.1 SR2 b315
Operating System: win7

Hello there,

im not really a professional in origin programing, and i have a problem fitting some data. The original function is about percolation:

log(k) = log(k0)+t*log(x+x0)

where
k is the conductivity of the komposit material
k0 is the conductivity of the pure polymer matrix
t is the parameter i want to determine
x is the mass ratio of condutive particles in the polymer
x0 is the critical percolation value i want to determine


I tried several equations in "non linear fitting", but I either have problemes with "not valid equation" if I enter "log(k)=..." or nothing is calculated by origin.

So my questio is: what do I have to do to get a fit?

YimingChen

1640 Posts
Posted - 07/11/2018 :  1:47:15 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

It seems you need to use implicit function to fit the curve. Please check this page:
https://www.originlab.com/doc/Tutorials/ImplicitFit-3Var

Thanks,
Yiming
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